package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;

import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {
    //新增菜品，同时插入菜品对应的口味数据，需要操作两张表：dish、dish_flavor
    @Autowired
    private DishFlavorService dishFlavorService;
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        //①. 保存菜品基本信息 ;
            this.save(dishDto);
        //②. 获取保存的菜品ID ;
        Long id = dishDto.getId();
        //③. 获取菜品口味列表，遍历列表，为菜品口味对象属性dishId赋值;
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors=flavors.stream().map((item)->{
            item.setDishId(id);
            return item;
        }).collect(Collectors.toList());
        //④. 批量保存菜品口味列表;
        dishFlavorService.saveBatch(flavors);
    }

    @Override
    public DishDto getByIdWithFlavor(Long id) {
        //查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);
        //将dish中的数据赋给dishdto
        DishDto dishDto=new DishDto();
        BeanUtils.copyProperties(dish,dishDto);
        //查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper=new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(DishFlavor::getDishId,id);
        //由于dishdto需要一个flacor数组
        List<DishFlavor> dishFlavorsList=dishFlavorService.list(lambdaQueryWrapper);

        dishDto.setFlavors(dishFlavorsList);

        return dishDto;
    }


    @Override
    public void updateByIdWithFlavor(DishDto dishDto) {
        ///更新dish表基本信息
        this.updateById(dishDto);

        //清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dishDto.getId());

        dishFlavorService.remove(queryWrapper);
        //添加当前提交过来的口味数据---dish_flavor表的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();
        //insert into dishflavor values(....);
        flavors=flavors.stream().map((item)->{
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());
        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 批量删除,操作两张表删除dish还要删除口味表
     * @param ids
     */
    @Override
    public void remove(List<Long> ids) {
        //构造条件
        LambdaQueryWrapper<Dish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.in(Dish::getId,ids);
        queryWrapper.eq(Dish::getStatus,1);
        int count = this.count(queryWrapper);
        if (count>0){
            throw new CustomException("套餐正在售卖中无法删除");
        }
        this.removeByIds(ids);
        //2.构造条件
        LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper=new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(DishFlavor::getDishId,ids);
        dishFlavorService.remove(lambdaQueryWrapper);
    }


}
